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EFFECT OF TIME HARMONICS ON THE THRUST OF A LINEAR INDUCTION MOTOR WITH DISCRETE WINDINGS

A study is presented of a linear induction motor fed from a nonsinusoidal constant current supply. It is shown that time harmonics reduce the thrust developed by the motor, particularly at low slips. Discreteness of the winding influences the performance of the motor as slot edges introduce another type of end effects. The measured results demonstrate that slot harmonics cause significant dips in the thrust-slip characteristics. The study may be useful in the cases of linear induction motors used in high speed ground transportation where the utilization of inverters for speed control is inevitable.